GB1331841A - Electro-acoustic transducer - Google Patents

Electro-acoustic transducer

Info

Publication number
GB1331841A
GB1331841A GB2227071A GB2227071A GB1331841A GB 1331841 A GB1331841 A GB 1331841A GB 2227071 A GB2227071 A GB 2227071A GB 2227071 A GB2227071 A GB 2227071A GB 1331841 A GB1331841 A GB 1331841A
Authority
GB
United Kingdom
Prior art keywords
acoustic
reflectors
reflector
transducer element
electro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2227071A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB1331841A publication Critical patent/GB1331841A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

1331841 Acoustic reflectors; piezoel-ectric transducers MITSUBISHI DENKI KK 19 April 1971 [25 Feb 1970] 22270/71 Headings H4J and H4X A cylindrical electro-acoustic transducer element 1 (Fig. 5B) has an inner acoustic reflector 5 and an outer acoustic reflector 7. Both reflectors are preferably of substantially conical shape but the outer reflector 7 may be circumferentially incomplete (Figs. 5A, 5C). Phase matching of acoustic energy from the inner and outer reflectors is achieved by appropriate selection of the angles of the cones and the operating frequency so that waves transmitted in the direction P reinforce each other. The transducer element 1 is of barium titanate or lead zirconate lead titanate. The reflectors 5, 7 may be produced by using curved generator lines instead of straight generator lines as shown. An acoustic shield 8 provides selected directivity. The devices are for transmission or reception of audible or ultrasonic signals.
GB2227071A 1970-02-25 1971-04-19 Electro-acoustic transducer Expired GB1331841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1608270 1970-02-25

Publications (1)

Publication Number Publication Date
GB1331841A true GB1331841A (en) 1973-09-26

Family

ID=11906614

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2227071A Expired GB1331841A (en) 1970-02-25 1971-04-19 Electro-acoustic transducer

Country Status (4)

Country Link
US (1) US3703652A (en)
DE (1) DE2109013C3 (en)
FR (1) FR2161734B1 (en)
GB (1) GB1331841A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982142A (en) * 1973-11-05 1976-09-21 Sontrix, Inc. Piezoelectric transducer assembly and method for generating a cone shaped radiation pattern
US4142412A (en) * 1976-05-12 1979-03-06 Sutures Inc. Doppler flow meter and method
US4259870A (en) * 1979-02-26 1981-04-07 Howmedica Inc. Doppler method of measuring flow
US4439847A (en) * 1981-12-21 1984-03-27 The Stoneleigh Trust High efficiency broadband directional sonar transducer
US4582065A (en) * 1984-06-28 1986-04-15 Picker International, Inc. Ultrasonic step scanning utilizing unequally spaced curvilinear transducer array
US4630342A (en) * 1984-12-21 1986-12-23 Motorola, Inc. Method of mounting a piezoelectric helmholtz transducer on a printed circuit board
US5212671A (en) * 1989-06-22 1993-05-18 Terumo Kabushiki Kaisha Ultrasonic probe having backing material layer of uneven thickness
WO2014165677A1 (en) * 2013-04-03 2014-10-09 Tulane University Expression of hiv inhibitors by mesenchymal stem cells
FR3007926B1 (en) * 2013-06-27 2016-01-08 Areva Np ULTRASONIC TRANSDUCER

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2005741A (en) * 1932-12-15 1935-06-25 Harvey C Hayes Magneto-strictive sound generator
US2855526A (en) * 1955-10-24 1958-10-07 Aeroprojects Inc Apparatus for generating ultrasonic energy of high intensity
US3271596A (en) * 1963-11-12 1966-09-06 Boeing Co Electromechanical transducers
US3302163A (en) * 1965-08-31 1967-01-31 Jr Daniel E Andrews Broad band acoustic transducer
US3325779A (en) * 1965-09-13 1967-06-13 Westinghouse Electric Corp Transducer

Also Published As

Publication number Publication date
DE2109013B2 (en) 1975-01-09
FR2161734A1 (en) 1973-07-13
DE2109013A1 (en) 1971-09-16
US3703652A (en) 1972-11-21
FR2161734B1 (en) 1976-07-09
DE2109013C3 (en) 1975-08-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees